Vacuum-pump



VACUUM PUMP.

Il Il! Il Il lll l I' .W 'IMI' I hl mlldl UNWl l e i Hw.

(No Model.)

W. E. UIUUURSON su A. BURRUNBERG.

No.A 453,277.

WE1-VI 555:5.

(No Mmm.. r Y 2 sheets-sheet 2. W. E. NICKERSON 85 A. BERRENBERG.

VACUUM PUMP. No. 453,277. 'PatentedJun'e 2,1891.

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PATENT OFFICE.

lVILLIAM E. NICKERSON, OF CAMBRDGE, AND ADOLPH BERRENBERG, OF

SOMERVILLE, llIASSACHUSETTS," ASSIGNORS TO THE BEACON VACUUM PUMP AND ELECTRICAL COMPANY, OF PORTLAND, MAINE.

VACUUM-PUMP.'

srncrrroArIoN 'forming para of Laers'ratent Nb. 453,277, dated .rune 2, 1891.

Application filed June 20, -1890. Serial No. 356,104. (No model.)

.To all whom it may'colwern:

ne it known that we, WILLIAM E; NIQER- soN, of Cambridge, and 'ADOLPH BERREN- BERG,'of Somerville, both in the county of Middlesex and State of Massachusetts, have invented new and useful Improvements inV Vacuum-Pumps, of which the following, taken in connection with the accompanying drawings, is a specification.' n Y The object 'of this'invention is to so construct and arrange a vacuum-pump that the ow of air from the article being exhausted shall be continuous and without abrupt'pulsations, Aand that the use of valves, pistons, r 5 and joints may be avoided.l The mechanical device, taken in connection with a sealingliquid, constitutes the invention, which may be understood by reference to the accompanying drawings, in which- Figure l is a'front elevation of the device, the front of the outside casing being 'represented as removed so that the interior construction and arrangement may be more clearly shown. Fig. 2 is an end elevation and z 5 section of parts of the device. Fig. 3 shows a part of the same inplan. Fig. 4. represents one of the elastic pipes collapsed at intervals. Fig. 5 is a cross-section of one of the pipes. Fig. 6 is a crosssection of, oneof the pipes collapsed.

In the drawings, A represents the base of the pump, and B a case, which, together with the base A, forms a tank or receiver in which the pump proper is inclosed.

in housings H 1I, Fig. 1. For sealing the shaft D as it passes through the case B, a pocket B is formed on the outside of the case, so that the packing-box D3 may be covered with a 4c scaling-liquid, as indicated in Fig. l.

D2 represents a packing-box formed in the wall of the pocket, and serves to make the joint around the shaft D tight.

D is a driving-pulley.

Upon the main shaft D two six-armed spiders C C are placed and securely fastened. Long rolls E are 'journaled in the arms of the Spiders, as shown. These rolls E have annular grooves e e in them, dividing them into 5o divisions e e', and eachflroll is provided with The main shaft D of the pump is mounted a gear E" at one end. The 'gears E' engage with an internal gear E2, the whole device being so constructed that when a the main shaft D rotates the rolls E revolve about the center ofthe shaft D, and at the same time each is made to rotate on' its own center' with a determined rate of speed controlled by the internal gear E2, said internal gear E2 being rigidly attached to the base A by bolts or otherwise. Each division e e traverses ina 6o groove A', made iu the base A.' The Walls of these grooves are shown ata a, Fig. l. Elastic pipes R R are placed one in each of the grooves A. The divisions e e' of the rolls E E'are so adjusted as to collapse the. pipes 65 R by pressing upon them Yas they lie in the grooves A. (Sec Fig. 2.) The' pipes R are each united to ahollow shaft R and through it to a short pipe R3, extending laterally from the pipe R4. The hollow shafts R are each 7c provided with a gear R2, so that they may be made to rotate slowly. These shafts R fit closelyinto the short pipes R3 and are free to turn with the gears. The gears R2 are rotated by the following-described device.

K is a bent lever pivoted at K' to the base, and is operated by the cam D4 (see Fig. 2) and spring S. At the lower end of the bent lever ,K a pawl lK2 is attached. This pawl K2 engages with the teeth of the gear K3 and causes 8o it and through it all of the gears R2 R2 to slowly rotate, their motion being'intermittent. As the elastic. pipes R R are each indirectly connected with one of these gears R2 it is evident that they must also rotate. y 8 5.

The operation of this device is as follows; Oil or some other suitable sealing-fluid is admitted to each of Vthe 'pipes R R through openings located at some convenient point, as at T, Fig. 2. Now as the rolls E pass over go the pipes in the grooves A' in the base A the pipes Aare collapsed, as indicated, and as the collapsing action advances it is evident'that a vacuum is formed behind the point at which the pipe is just collapsed, and that as the rolls E continue to advance the vacuum-form-- ing action must continue and thus cause a' iiow of air into the pipe R and from the pipe R4, thus causinga vacuum in the pipe R4 and Vin the article connectedY to it. The oil or roo other sealing-liquid in the pipes R serves to completely seal and make air-tight the pipes at the points when they are collapsed.

The object in causing the pipes to slowlyrotate or twist on the axis is to prevent them from -being worn out in one part more -.than in another. i

The rolls E E rotate on their axes a little lfaster than they would if left free to roll on4 the pipes R R, being impelled by the gears -E E', which engage with the fixed internal gear E2, the pitch-line of the gearsE E being less in circumference than the rolls E E,

so that the peripheral motion of the rolls will be more than that due to rolling on the pipes. This acceleration of the peripheral motion of the rolls prevents the forcing forward of the pipes, which if allowed to take place would place them under great longitudinal strain,

which would tear them apart or at least serif and larger pipes can be used, as in this case the resilience of the pipes will not be opposed by the pressure of the air except to a limited extent.

We claim- 1. In a vacuum-pump, the combination of elastic compressible pipes and rolls having mechanism adapted to force said rolls along vthe pipes and collapse the same with a sealing-liquid within the pipes to completely seal them at the collapsed points, substantially as and for the purpose set forth.

2. In a vacuum-pump, the conglination of the elastic compressible pipes a d rolls E E for collapsing them, operating as described, withmechanism whereby the rolls E E rotate on their axes faster than they would if left free to roll on the pipes B. R, substantially as and for the purpose set forth.

3. In a vacuum-pump,.the combination of elastic compressible pipes and. rolls E Efor collapsing them, as described, with mechanism whereby the vsaid pipes are made to slowly rotate on their central lines,substan 5 tially as and for the purpose set forth.

WILLIAM E. NICKERSON. ADQLPH BERRENBERG. lVitnesses: l v FRANK G. PARKER, WILLIAM EDsoN. f 

